JSON Lines Converter
Convert JSONL / NDJSON into a JSON array, pretty JSON blocks, CSV, or a line-by-line parse report. Everything runs locally in your browser.
Input JSONL / NDJSON
One valid JSON value per line
Converted Output
Copy or download the converted result
What is JSON Lines?
Log friendly
JSON Lines stores one JSON value per line, making it ideal for logs, streams, analytics exports, and large datasets.
Also called NDJSON
NDJSON means newline-delimited JSON. It is the same practical format used by many APIs and data tools.
Easy conversion
Use JSON array output for APIs, CSV output for spreadsheets, or parse report mode to debug invalid data lines.